以二氧化钛改性8-羟基喹啉铝复合材料(TiO2-Alq3)为发光层制备了有机电致发光器件(OLED)。在器件未封装条件下, 复合材料TiO2-Alq3制备的器件较纯Alq3制备的器件抗老化性能有所提高。通过化学计量比调控, 当钛酸四丁酯与硫酸铝的投料比为1∶10时制备的复合材料TiO2-Alq3可获得抗老化性能最优的OLED器件。在空气中老化48 h后, 该器件亮度仍保持在起始亮度的89.7%, 电流效率保持在起始值的76.6%, 而纯Alq3制备的OLED器件在同样测试条件下已失活。

Composite material titanium dioxide doped tris(8-hydroxyquinoline)-aluminium (TiO2-Alq3) was applied in organic lighting emitting diodes (OLED) as emitting material. Without encapsulation, it is found that TiO2-Alq3 as emitting layer in OLED exhibits significantly improved anti-aging performance than that of the pure Alq3-based OLED. It can be attributed to the introduced of TiO2, which has good photochemical stability and the absorption ability in UV, etc. The OLED with optimized anti-aging performance was obtained after tuning the molar ration of reactants tetrabutyl titanate and aluminium sulfate to 1∶10. After aging 48 h in the air, the luminance and current efficiency of this optimized OLED still remained in the initial state of 89.7% and 79.6%, respectively. This work paves a new way to improve the anti-aging performance of OLED by modifying the emitting materials.